package juc;


import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

class ShareResource
{
    private int number = 1; //1:A 2:B 3:C
    /**
     * condition1.await()后 通知 condition2
     */
    private Lock lock = new ReentrantLock();
    private Condition condition1 = lock.newCondition();
    private Condition condition2 = lock.newCondition();
    private Condition condition3 = lock.newCondition();


    public void print5() {
        lock.lock();
        try {
            //1、判断
            while(number != 1) {
                condition1.await();
            }
            //2、干活
            for(int i = 1; i<=5; i++) {
                System.out.println(Thread.currentThread().getName() + "\t" + i);
            }
            //3、通知
            number = 2;
            condition2.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
    public void print10() {
        lock.lock();
        try {
            //1、判断
            while(number != 2) {
                condition2.await();
            }
            //2、干活
            for(int i = 1; i<=10; i++) {
                System.out.println(Thread.currentThread().getName() + "\t" + i);
            }
            //3、通知
            number = 3;
            condition3.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }

    public void print15()   {
        lock.lock();
        try {
            //1、判断
            while(number != 3) {
                condition3.await();
            }
            //2、干活
            for(int i = 1; i<=15; i++) {
                System.out.println(Thread.currentThread().getName() + "\t" + i);
            }
            //3、通知
            number = 1;
            condition1.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
}

/**
 * @author Guo
 * @Create 2020/8/20 9:44
 * 多线程之间按顺序调用 实现A-B-C
 * 三个线程启动 要求如下
 *
 * AA 打印5次 BB打印10次 CC打印15次
 * 接着
 * AA 5 BB 10 CC 15
 * 来10轮
 * lock 精确通知 精准唤醒
 */
public class ThreadOrderAccess {
    public static void main(String[] args) {
        ShareResource shareResource = new ShareResource();

        new Thread(() -> {
            for(int i = 1; i<=10; i++) {
                shareResource.print5();
            }
        },"A").start();
        new Thread(() -> {
            for(int i = 1; i<=10; i++) {
                shareResource.print10();
            }
        },"B").start();
        new Thread(() -> {
            for(int i = 1; i<=10; i++) {
                shareResource.print15();
            }
        },"C").start();
    }
}